Plow-lift



UNIT

ALFRED KRIEG, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO EMERSON-BRANTING-HAM COMPANY, OF ROCKFORD, ILLINOIS, A CORPORATION 0F ILLINOIS.

PLOW-LIFT.

Application filed March 26, 1917.

To all /wbo'lit t may conce/1in.' y

Bo it lnown that l, ALFRED Kaine, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inPlow-Lifts, of which the following is aspecification.

This invention relates in general to the art of tractor-operated plows,and has reference more particularly to a new and iniprovedpoweihoperated plow lift of the type .illustrated by U. S. LettersPatentlto Ed Award R. Greer, No. 1,199,005, dated Sept. 19, 1916.

The principal object of the invention is to provide an improved andsimplified mechanism of the self-locking type for raising and loweringthe boom from which the plow frame is suspended.

Other objects and advantages of the invention will be readily apparentto those skilled in the art from a consideration of the followingdescription taken in connection with the accompanying drawings, wherein-Figure 1 is a side elevation of the rear end of a tractor showing myimproved plow lift applied thereto.

Fig. 2 is a similar view partly in section and omitting the plow frame,and showing the boom in fully elevated position wherein the plows areraised clear of the ground.

Fig. 3 is a top plan view of Fig. 2.

Fig. 4t is a sectional view through the casing of the worin gearoperating and locking mechanism of the lift.

Since my present improvements relate entirely to the mechanism foractuating the lifting arm or boom, I have shown the portions of thetractor and the plow frame and plows somewhat dia-grainmatically inorder lto simplify the illustration. et designates `generally thetractor frame, 5 one of the rear wheels thereof, and 6 the rear axle.Suspended from the frame 4f is a bracket 7 to which the plow frame 8carrying a gang of plows 9 is pivotally attached with capacity for bothlateral and up and down swinging movement of the plow frame 8.

Supported in bearings 10 suspended from the main side bars of the frame1 is a transverse shaft 11, fast on which is a cam herein shown astaking the form of an ordinary circular eccentric disk 12. On the rearaxle 6 is fulcrumed with capacity for vertical speecation of LettersPatent.

Patented Feb. 8, 1921. sensi No. 157,540. i

swinging movement the forward end of a lifting lever or boom designatedas an entirety by 1e. At its pivoted end the boom 14 is preferablyconstructed with a generally triangular shape base-piece or bracket 15,and this bracket is provided with an extension or nose-piece 16, whichoverhangs the cam 12 and is preferably equipped with a roller 17 thatrides on the periphery of the cam. At its rear end the boom 14 isequipped with the usual hook 18 over which passes the chain 19 by whichthe plow frame 8 is suspended from the boom.

The cani shaft 11 is operated through the agency of a worm gear 20, thehub of which is keyed to the'shaft 11 as shown in Fig. 4, and a worin 21drivingly engaging the worm gear 20 and mounted on a shaft 22 which isdriven from the tractor engine through clutch controlled 4driving mechanisrn not herein shown, but which may be similar to that shown anddescribed in the patent to Greer, No, 1,199,005 hereinabove referred to.The worm gear 20 is housed within a casing 23, the hubs of which latterare supported on the shaft 11, the casing having a it'orward extensionor bracket 24 that is rigidly connected to the axle 6 by a U- bolt .Bythis means the casing 23 is rigidly held against turning on the rockshaft 11. The portion of the shaft 22 carrying the worin gear 21 isconveniently journaled in a depending extension 26 of the gear casing23, as clearly shown in Fig. 4:.

In Fig. 1, the boom is shown in its fully lowered position, and in Fig.2, in its fully raised position. lVhen the plows are to be lifted clearof the ground, the operator clutches the worm shaft 22 to the tractormotor, thereby turning the cam shaft 11 and eccentric 12 throughsubstantially a half turn, or less, depending upon the height to which.the plows are to be raised. The worm. gear operating mechanism beingselflocking, holds the boom at any point to which it may have beenelevated or lowered by the cani 12 without necessitating the pro visionof any separate means for locking it in elevated position.

am aware that it has heretofore been proposed to employ lifting leversthat are pivotally mounted intermediate their ends, and are actuated bycams or cranks engaging their free ends. By employing a lever of thelthird ela-ss and mounting the saine on a fulcrurn shaft (in this easethe rear axle) that is disposed forwardly of the operating' shaft, I ainenabled to shorten the total length of the machine and secure a simplerand more compact striieture.

In a ineohanisln of the Class described, the

combination of a tractor having a through axle, a lifting leverfulorulned at its forward end on the a-Xle and extending rearwardlybeyond the tractor and adapted for lifting at its rear end, and a poweroperated cam engaging the lever intermediate its ends for lifting therear end of the lever.

` ALFRED KRIEG.

